Não informado. (1919). Memoirs of the Botanical Survey of South Africa. Department of Agricultural Technical Services, Botanical Research.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Memoirs of the Botanical Survey of South Africa. Pretoria, Africa do Sul: Department of Agricultural Technical Services, Botanical Research, 1919.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Memoirs of the Botanical Survey of South Africa. Department of Agricultural Technical Services, Botanical Research, 1919.
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